With the development of smart waterway construction,flow velocity monitoring plays an important role in the accurate acquisition and real-time management of hydrological information.In response to the relative lack of research on flow velocity monitoring in complex water environments,an array radar flow measurement system is proposed and adopt.The array radar flow measurement experiment is conducted on-site in a certain water area of the Yangtze River to verify its monitoring effectiveness under complex water conditions.The system utilizes P-band radar and utilizes line array digital beam-forming technology and Bragg scattering principle to achieve non-contact real-time monitoring of water flow velocity.Fuzzy clustering algorithm is used to screen the Doppler characteristics of each waterway,and the data are compared with acoustic Doppler current profiler(ADCP) synchronous flow measurement data.The results show that the array radar flow measurement system has excellent flow measurement performance in complex water environments,providing an efficient and reliable technical means for flow velocity monitoring in the context of smart navigation.After removing the adverse effects of ship upward movement,the accuracy of radar wave surface flow field data is high,and the overall deviation of flow velocity obtained based on radar waves at experimental observation points is not greater than 7.00%,comparing with the ADCP synchronous flow measurement data.